Hi, I have a problem with my 2009 A6 where I can't get into the car. If I press the remote control, nothing happens but the diode flashes very quickly. But the car won't unlock. If I try with the real one in the door, nothing happens either and the lock cylinder feels very spongy. On the dashboard, some lights are on such as: oil warning, glow plug light, turn signal indicator and a few more. But everything electrical is completely dead. Can anyone advise what the fault could be? Thanks in advance! Peter